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MethodInvokingTimerTaskFactoryBean (Spring Framework API 2.0) - Spring Framework 2.0.5 API 文档英文版

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org.springframework.scheduling.timer
Class MethodInvokingTimerTaskFactoryBean

java.lang.Object
  extended by org.springframework.util.MethodInvoker
      extended by org.springframework.beans.support.ArgumentConvertingMethodInvoker
          extended by org.springframework.scheduling.support.MethodInvokingRunnable
              extended by org.springframework.scheduling.timer.MethodInvokingTimerTaskFactoryBean
All Implemented Interfaces:
Runnable, BeanClassLoaderAware, FactoryBean, InitializingBean
public class MethodInvokingTimerTaskFactoryBean
extends MethodInvokingRunnable
implements FactoryBean

FactoryBean that exposes a TimerTask object that delegates job execution to a specified (static or non-static) method. Avoids the need to implement a one-line TimerTask that just invokes an existing business method.

Derives from MethodInvokingRunnable to share common properties and behavior, effectively providing a TimerTask adapter for it.

Often used to populate a ScheduledTimerTask object with a specific reflective method invocation. Note that you can alternatively populate a ScheduledTimerTask object with a plain MethodInvokingRunnable instance as well (as of Spring 1.2.4), without the need for this special FactoryBean.

Since:
19.02.2004
Author:
Juergen Hoeller
See Also:
DelegatingTimerTask, ScheduledTimerTask.setTimerTask(java.util.TimerTask), ScheduledTimerTask.setRunnable(java.lang.Runnable), MethodInvokingRunnable, MethodInvokingFactoryBean

Field Summary
 
Fields inherited from class org.springframework.scheduling.support.MethodInvokingRunnable
logger
 
Constructor Summary
MethodInvokingTimerTaskFactoryBean()
           
 
Method Summary
 void afterPropertiesSet()
          Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).
 Object getObject()
          Return an instance (possibly shared or independent) of the object managed by this factory.
 Class getObjectType()
          Return the type of object that this FactoryBean creates, or null if not known in advance.
 boolean isSingleton()
          Is the object managed by this factory a singleton?
 
Methods inherited from class org.springframework.scheduling.support.MethodInvokingRunnable
getInvocationFailureMessage, resolveClassName, run, setBeanClassLoader
 
Methods inherited from class org.springframework.beans.support.ArgumentConvertingMethodInvoker
findMatchingMethod, getDefaultTypeConverter, getTypeConverter, registerCustomEditor, setTypeConverter
 
Methods inherited from class org.springframework.util.MethodInvoker
getArguments, getPreparedMethod, getTargetClass, getTargetMethod, getTargetObject, invoke, isPrepared, prepare, setArguments, setStaticMethod, setTargetClass, setTargetMethod, setTargetObject
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

MethodInvokingTimerTaskFactoryBean

public MethodInvokingTimerTaskFactoryBean()
Method Detail

afterPropertiesSet

public void afterPropertiesSet()
                        throws ClassNotFoundException,
                               NoSuchMethodException
Description copied from interface: InitializingBean
Invoked by a BeanFactory after it has set all bean properties supplied (and satisfied BeanFactoryAware and ApplicationContextAware).

This method allows the bean instance to perform initialization only possible when all bean properties have been set and to throw an exception in the event of misconfiguration.

Specified by:
afterPropertiesSet in interface InitializingBean
Overrides:
afterPropertiesSet in class MethodInvokingRunnable
Throws:
ClassNotFoundException
NoSuchMethodException

getObject

public Object getObject()
Description copied from interface: FactoryBean
Return an instance (possibly shared or independent) of the object managed by this factory.

As with a BeanFactory, this allows support for both the Singleton and Prototype design pattern.

If this FactoryBean is not fully initialized yet at the time of the call (for example because it is involved in a circular reference), throw a corresponding FactoryBeanNotInitializedException.

As of Spring 2.0, FactoryBeans are allowed to return null objects. The factory will consider this as normal value to be used; it will not throw a FactoryBeanNotInitializedException in this case anymore. FactoryBean implementations are encouraged to throw FactoryBeanNotInitializedException themselves now, as appropriate.

Specified by:
getObject in interface FactoryBean
Returns:
an instance of the bean (can be null)
See Also:
FactoryBeanNotInitializedException

getObjectType

public Class getObjectType()
Description copied from interface: FactoryBean
Return the type of object that this FactoryBean creates, or null if not known in advance.

This allows one to check for specific types of beans without instantiating objects, for example on autowiring.

In the case of implementations that are creating a singleton object, this method should try to avoid singleton creation as far as possible; it should rather estimate the type in advance. For prototypes, returning a meaningful type here is advisable too.

This method can be called before this FactoryBean has been fully initialized. It must not rely on state created during initialization; of course, it can still use such state if available.

NOTE: Autowiring will simply ignore FactoryBeans that return null here. Therefore it is highly recommended to implement this method properly, using the current state of the FactoryBean.

Specified by:
getObjectType in interface FactoryBean
Returns:
the type of object that this FactoryBean creates, or null if not known at the time of the call
See Also:
ListableBeanFactory.getBeansOfType(java.lang.Class)

isSingleton

public boolean isSingleton()
Description copied from interface: FactoryBean
Is the object managed by this factory a singleton? That is, will FactoryBean.getObject() always return the same object (a reference that can be cached)?

NOTE: If a FactoryBean indicates to hold a singleton object, the object returned from getObject() might get cached by the owning BeanFactory. Hence, do not return true unless the FactoryBean always exposes the same reference.

The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.

NOTE: This method returning false does not necessarily indicate that returned objects are independent instances. An implementation of the extended SmartFactoryBean interface may explicitly indicate independent instances through its SmartFactoryBean.isPrototype() method. Plain FactoryBean implementations which do not implement this extended interface are simply assumed to always return independent instances if the isSingleton() implementation returns false.

Specified by:
isSingleton in interface FactoryBean
Returns:
if the exposed object is a singleton
See Also:
FactoryBean.getObject(), SmartFactoryBean.isPrototype()
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